CN110950142B - Coiling mechanism is used in production of BOPP membrane - Google Patents
Coiling mechanism is used in production of BOPP membrane Download PDFInfo
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- CN110950142B CN110950142B CN201911280088.6A CN201911280088A CN110950142B CN 110950142 B CN110950142 B CN 110950142B CN 201911280088 A CN201911280088 A CN 201911280088A CN 110950142 B CN110950142 B CN 110950142B
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- rack
- bopp film
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- 239000011127 biaxially oriented polypropylene Substances 0.000 title claims abstract description 39
- 229920006378 biaxially oriented polypropylene Polymers 0.000 title claims abstract description 39
- 230000007246 mechanism Effects 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000012528 membrane Substances 0.000 title description 7
- 238000004804 winding Methods 0.000 claims abstract description 66
- 238000003908 quality control method Methods 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 11
- 230000006872 improvement Effects 0.000 description 6
- 238000003825 pressing Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000005021 flexible packaging material Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/26—Registering, tensioning, smoothing or guiding webs longitudinally by transverse stationary or adjustable bars or rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H18/00—Winding webs
- B65H18/08—Web-winding mechanisms
- B65H18/10—Mechanisms in which power is applied to web-roll spindle
Landscapes
- Winding Of Webs (AREA)
Abstract
The invention relates to the technical field of BOPP film production equipment, in particular to a winding device for producing a BOPP film, which comprises a rack, a driving motor and a control cabinet, wherein the driving motor and the control cabinet are arranged on one side surface of the rack; according to the invention, the tension adjusting effect on the BOPP film is realized through the effect of the adjusting roller, the tension balance is realized through the pressure sensor, the emergency shutdown function is realized through the proximity switch, in addition, the winding quality can be ensured through the winding quality control mechanism, and the effect of winding the BOPP film is excellent.
Description
Technical Field
The invention relates to the technical field of BOPP film production equipment, in particular to a winding device for producing a BOPP film.
Background
BOPP films are a very important flexible packaging material, which is colorless, odorless, tasteless, non-toxic, and has high tensile strength, impact strength, rigidity, toughness, and good transparency. The production process of the BOPP film comprises the steps of firstly melting a polymer, then manufacturing the polymer into a sheet or a thick film through a long and narrow machine head, finally performing stretching forming in the longitudinal direction and the transverse direction in a special stretching machine, and coiling the formed coating and the edge cut by a coiling machine to obtain the common BOPP film in the market.
In the process of rolling the BOPP film, the control of the rolling tension is very important, and when the tension is too large and the rolling is too tight, the film is easy to wrinkle; when the tension is insufficient, the amount of air brought into the film layer is too much, and the film roll generates a large amount of bubbles, even the film generates axial slippage and serious dislocation on the core roll, so that the roll can not be unloaded. The invention with the patent number of CN107628457A discloses a film winding machine, which comprises a winding machine frame, wherein the frame comprises a frame base, frame walls and winding drums, the frame walls are arranged on two sides of the frame base, the winding drums are erected between the frame walls, the winding drums are rotationally connected to the frame walls on two sides through rotating shafts, the winding drums are connected with a winding drum driving device, the driving device comprises a chain wheel set connected with the rotating shafts and a motor used for driving the chain wheel set to rotate, movable compression rollers are arranged on the outer sides of the winding drums in parallel, the compression rollers are in contact with films on the winding drums, and the compression rollers are connected with automatic adjusting devices used for keeping the compression rollers to compress the films at constant pressure; although the constant tension is kept when the film winding machine winds the film all the time through the tension sensor and the compression roller, in practice, certain air is clamped between the film layers, the content of the air is larger than 12-18%, and the phenomenon that the inner film is wrinkled by the outer film can also occur even under the constant tension condition. In addition, the film winder does not have an emergency automatic stop function, when the difference between the feeding speed and the winding speed is too large, the film can be broken, the film can be continuously wound after the film winder needs to be stopped, the roll is changed and adjusted, a large amount of waste products are caused, and the capacity loss caused by the stop is increased. Therefore, aiming at the defects in the existing film winding process, the invention provides the winding device for producing the BOPP film, which can effectively solve the technical problems.
Disclosure of Invention
The invention aims to solve the technical problem of designing a winding device for producing a BOPP film, which is used for solving the problems that crumpling is easy to occur when an existing film winding machine winds the film and the BOPP is broken due to the speed difference.
The invention is realized by the following technical scheme:
a winding device for BOPP film production comprises a rack, a driving motor and a control cabinet, wherein the driving motor and the control cabinet are arranged on one side face of the rack, an output shaft of the driving motor is connected with a reduction gearbox, an output shaft of the reduction gearbox is connected with a winding roller, the other end of the winding roller is arranged in a suspended manner, the front end of the rack is rotatably connected with a guide-in roller, an adjusting roller is arranged on the rack behind the guide-in roller, vertical grooves are formed in the rack on the left side and the right side of the adjusting roller, slide rods are vertically arranged in the vertical grooves, lifting blocks are connected to the left end and the right end of the adjusting roller, the adjusting roller is rotatably connected with the lifting blocks, a sliding sleeve capable of sliding up and down along the slide rods is connected to the outer side face of each lifting block, a metal sheet is arranged on the upper surface of each lifting block, a proximity switch is arranged on the top wall of each vertical groove, and the metal sheet and the proximity switch are positioned on the same vertical line, a pressure sensor is arranged on the bottom wall of the vertical groove, an elastic part is connected to the upper surface of the pressure sensor, a ring piece is connected to the upper end of the elastic part, an intermediate roller is rotatably connected to the rack positioned on the rear side of the adjusting roller, the intermediate roller and the guide-in roller are positioned on the same horizontal plane, and a winding quality control mechanism is arranged on the rear side of the intermediate roller;
wherein, rolling quality control mechanism includes that two Z shapes rotate strip, cornerite adjust roll and pinch roller rotate respectively and set up the lower extreme and the upper end that rotate the strip at Z shape, the cornerite adjust roll is located the below setting of middle roller, the pinch roller sets up directly over the wind-up roll, and laminates mutually with the wind-up roll, two Z shape rotates the lateral surface interlude of strip and is connected with the pivot, Z shape rotates the strip and rotates the setting in the frame through the pivot, Z shape rotates the lateral surface upper end of strip and is connected with the flange, the lower surface of flange is connected with compression spring, compression spring's lower surface is connected with the both sides upper surface of frame.
As a further improvement of the scheme, the left end and the right end of the winding roller are provided with side movement prevention baffles, the side movement prevention baffles at the two ends of the winding roller can prevent the film from deviating when reaching a certain thickness, and the film is guaranteed to be wound neatly.
As a further improvement of the above scheme, be close to the side of preventing of driving motor one side moves baffle and wind-up roll fixed connection, keeps away from driving motor one side prevent that the side moves the baffle and can dismantle between the wind-up roll and be connected, keep away from seted up the arc breach on the frame curb plate of driving motor one side, will keep away from the side of preventing of driving motor one side after the rolling is accomplished and move the baffle and lift off, be convenient for take out whole membrane book from the arc breach.
As a further improvement of the scheme, a threaded hole is formed in the winding roller on one side far away from the driving motor, a through hole is formed in the center of the side-shift-preventing baffle, a fixing bolt connected with the threaded hole is arranged in the through hole, the side-shift-preventing baffle can be quickly and conveniently installed and detached with the winding roller by an operator through the detachment connection of the threaded hole and the spiral.
As a further improvement of the scheme, a distance sensor is arranged under the winding roller and connected with the control cabinet, the thickness of the wound film in the winding process can be accurately measured through the distance sensor, when a set value is reached, the distance sensor outputs a signal to the control cabinet, the control cabinet controls the driving motor to stop running, and the accurate control of the thickness of the wound film can be realized.
As a further improvement of the scheme, the elastic piece is an elastic piece or a spring ring, the elastic piece can play a role in buffering the adjusting roller sliding downwards, the force under the buffering pressure is transmitted to the pressure sensor in real time, the pressure sensor transmits a signal to the control cabinet, and finally the control cabinet controls the frequency converter to realize the function of controlling the rotating speed of the driving motor.
Has the advantages that:
1. compared with the prior art, the BOPP film winding device has the advantages that through the arrangement of the adjusting roller, the pressure sensor and the proximity switch, when the tension of the BOPP film in the winding process is too small, the gravity of the adjusting roller is larger than the upward force of the BOPP film, the sliding sleeves at the two ends of the adjusting roller move downwards along the sliding rod, the BOPP film can be tensioned, the surface tension of the BOPP film can be increased, the winding quality is ensured, when the sliding sleeves slide downwards to be in contact with the ring piece, the pressure sensor is subjected to pressure increase, signals are transmitted to the control cabinet, the control cabinet controls the frequency converter inside the control cabinet to achieve the function of increasing the rotating speed of the driving motor, and when the tension of the BOPP film is too large, the adjusting roller moves upwards along the sliding rod, the tension of the BOPP film can be reduced, and the tension of the BOPP film in the winding process is always in dynamic balance; even when the BOPP film is too high in tension and easy to break, the adjusting roller slides up to the sensing range of the proximity switch, the proximity switch transmits signals to the control cabinet, the control cabinet controls the driving motor to suddenly stop, breaking caused by too high tension of the BOPP film in the winding process can be avoided, and capacity loss caused by stopping is greatly reduced.
2. According to the invention, the compression roller is rotatably arranged on the Z-shaped rotating strip, the thickness of the film is gradually increased along with the winding process, the film is abutted against the compression roller to move upwards, the wrap angle adjusting roller connected with the lower end of the rotating strip moves towards the lower part close to the winding roller, so that the wrap angle a of the BOPP film is gradually increased during winding, and the clearance space between the BOPP film and the film roll is reduced along with the increase of the wrap angle a of the film, so that the air in the clearance space is effectively discharged, and the quality of the film in the winding process is effectively ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a first angular perspective structure of the present invention;
FIG. 2 is a schematic view of a second angular perspective structure according to the present invention;
FIG. 3 is an enlarged view taken at A in FIG. 1;
FIG. 4 is a schematic perspective view of a winding quality control mechanism according to the present invention;
FIG. 5 is a front internal plan view of the present invention;
FIG. 6 is a control schematic diagram of the present invention;
fig. 7 is a disassembled perspective view of the wind-up roll in embodiment 1.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to the accompanying drawings 1 to 7, in conjunction with the embodiments.
Example 1
Embodiment 1 has introduced a coiling mechanism for BOPP membrane production, major structure includes frame 1, driving motor 2 and switch board 3, and wherein frame 1 comprises the vertical curb plate at bottom plate and both ends, and driving motor 2 and switch board 3 all set up the vertical curb plate outside of frame 1. Wherein, driving motor 2 is common asynchronous machine, is connected with reducing gear box 4 on driving motor 2's the output shaft, is connected with wind-up roll 5 on reducing gear box 4's the output shaft to the other end unsettled setting of wind-up roll 5.
The front end of the frame 1 is rotatably provided with a guide roller 6, the frame behind the guide roller 6 is provided with an adjusting roller 7, vertical side plates of the frame 1 on the left side and the right side of the adjusting roller 7 are provided with vertical grooves 701, slide bars 702 are vertically arranged in the vertical grooves 701, the left end and the right end of the adjusting roller 7 are connected with lifting blocks 703, the adjusting roller 7 and the lifting blocks 703 are rotatably connected through built-in bearings (not shown in the figure), the outer side surface of the lifting blocks 703 is connected with a sliding sleeve 704, and the sliding sleeve 704 is matched with the slide bars 702 to enable the sliding sleeve 704 to slide up and down along the slide bars 702. The upper surface of the lifting block 703 is provided with a metal sheet 705 which can be made of copper sheets or iron sheets, the top wall of the vertical groove 701 is provided with a proximity switch 706, the proximity switch 706 can be made of eddy current type proximity switches, the metal sheet 705 and the proximity switch 706 are positioned on the same vertical line, and when the metal sheet 705 enters the sensing distance of the proximity switch 706, the proximity switch generates an electric signal and transmits the electric signal to the control cabinet 3. Be provided with pressure sensor 707 on the diapire of perpendicular groove 701, pressure sensor 707 upper surface is connected with elastic component 708, and the upper end of elastic component 708 is connected with the ring 709, and elastic component 708 in this embodiment can be shell fragment or spring coil, and it can not only play the cushioning effect to the gliding of adjusting roller 7, need transmit the accurate pressure sensor 707 of giving of buffer power moreover.
An intermediate roller 8 is rotatably connected to the frame 1 behind the adjusting roller 7, the intermediate roller 8 and the introducing roller 6 are located on the same horizontal plane, a winding quality control mechanism 9 is arranged behind the intermediate roller 8, the winding quality control mechanism 9 comprises two Z-shaped rotating strips 901, a wrap angle adjusting roller 902 and a pressing roller 903, the wrap angle adjusting roller 902 and the pressing roller 903 are respectively rotatably arranged at the lower end and the upper end of the Z-shaped rotating strips 901, the wrap angle adjusting roller 902 is arranged below the intermediate roller 8, the pressing roller 903 is arranged right above the winding roller 5, the pressing roller 903 is attached to the upper circumferential surface of the winding roller 5, a rotating shaft (not marked in the figure) is connected to the middle section of the outer side surface of the two Z-shaped rotating strips 901, and the Z-shaped rotating strips 901 are rotatably arranged on the vertical side plate of the frame 1 through the rotating shaft. Meanwhile, the upper end of the outer side face of the Z-shaped rotating strip 901 is connected with a convex plate 904, the lower surface of the convex plate 904 is connected with a compression spring 905, the lower surface of the compression spring 905 is connected with the upper surfaces of two vertical side plates of the rack 1, and the compression roller 903 and the wind-up roller 5 are tightly attached through the compression spring 905, so that the compression effect is achieved on the BOPP in the winding process.
Finally, in order to realize the fixed-circle winding of the BOPP film, a distance sensor 10 is arranged under the winding, and the embodiment selects an H-PT50 high-precision laser ranging sensor with the precision as high as 0.01mm, so that the number of turns of the BOPP film can be measured. The distance sensor 10 is connected with the control cabinet 3, the thickness of the rolled film in the rolling process can be accurately measured through the distance sensor 10, when the set value is reached, the distance sensor 10 outputs a signal to the control cabinet 3, the control cabinet 3 controls the driving motor 2 to stop running, and the accurate control of the thickness of the rolled film can be realized.
Example 2
Embodiment 2 describes a wind-up roll which is convenient for unwinding and is prevented from lateral movement, and all parts except for processing the wind-up roll are the same as those in embodiment 1, and refer to fig. 7. In this embodiment 2, the two ends of the wind-up roll are provided with the side shift preventing baffle 501, and the side shift preventing baffle 501 is circular, but the diameter is larger than the cross-sectional diameter of the wind-up roll. The side shift preventing baffle 501 close to one side of the driving motor 2 is fixedly connected with the winding roller 5, the side shift preventing baffle 501 far away from one side of the driving motor 2 is detachably connected with the winding roller 5, a threaded hole 502 is formed in the end face of the winding roller 5 far away from one side of the driving motor 2, a through hole is formed in the center of the side shift preventing baffle 501, a fixing bolt 503 is arranged through the through hole, the fixing bolt 503 is connected with the threaded hole 502, an arc notch 101 is formed in the vertical side plate of the rack 1 far away from one side of the driving motor 2, through the simple design, the side shift preventing baffle 501 far away from one side of the driving motor 2 can be quickly taken down, then a film winding inner core (not shown in the figure) is sleeved, and the side shift preventing baffle 501 is quickly installed through connection of the bolt 503 and the threaded hole 502. After the rolling is accomplished, pull down fast and prevent sideslip baffle 501, then will roll up the membrane inner core and roll up the membrane of winding above and take off, it compares with current BOPP membrane rolling machine, need not to change whole wind-up roll.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A winding device for BOPP film production comprises a rack, a driving motor and a control cabinet, and is characterized in that the driving motor and the control cabinet are arranged on one side face of the rack, an output shaft of the driving motor is connected with a reduction gearbox, an output shaft of the reduction gearbox is connected with a winding roller, the other end of the winding roller is arranged in a suspended manner, the front end of the rack is rotatably connected with a guide roller, an adjusting roller is arranged on the rack behind the guide roller, vertical grooves are formed in the rack on the left side and the right side of the adjusting roller, a slide rod is vertically arranged in each vertical groove, lifting blocks are connected with the left end and the right end of each adjusting roller, the adjusting rollers are rotatably connected with the lifting blocks, the outer side faces of the lifting blocks are connected with sliding sleeves capable of sliding up and down along the slide rods, metal sheets are arranged on the upper surfaces of the lifting blocks, proximity switches are arranged on the top walls of the vertical grooves, the metal sheet and the proximity switch are positioned on the same vertical line, a pressure sensor is arranged on the bottom wall of the vertical groove, the upper surface of the pressure sensor is connected with an elastic part, the upper end of the elastic part is connected with a ring sheet, a middle roller is rotatably connected to the rack positioned on the rear side of the adjusting roller, the middle roller and the guide-in roller are positioned on the same horizontal plane, and a winding quality control mechanism is arranged on the rear side of the middle roller;
wherein, rolling quality control mechanism includes that two Z shapes rotate strip, cornerite adjust roll and pinch roller rotate respectively and set up the lower extreme and the upper end that rotate the strip at Z shape, the cornerite adjust roll is located the below setting of middle roller, the pinch roller sets up directly over the wind-up roll, and laminates mutually with the wind-up roll, two Z shape rotates the lateral surface interlude of strip and is connected with the pivot, Z shape rotates the strip and rotates the setting in the frame through the pivot, Z shape rotates the lateral surface upper end of strip and is connected with the flange, the lower surface of flange is connected with compression spring, compression spring's lower surface is connected with the both sides upper surface of frame.
2. The winding device for producing the BOPP film as claimed in claim 1, wherein side-shift-preventing baffles are arranged at the left end and the right end of the winding roller.
3. The winding device for BOPP film production according to claim 2, wherein the side shift preventing baffle plate close to one side of the driving motor is fixedly connected with the winding roller, the side shift preventing baffle plate far away from one side of the driving motor is detachably connected with the winding roller, and an arc-shaped notch is formed in a side plate of the rack far away from one side of the driving motor.
4. The winding device for producing the BOPP film as claimed in claim 3, wherein a threaded hole is formed in the winding roller at the side far away from the driving motor, a through hole is formed in the center of the side-shift-preventing baffle, and a fixing bolt connected with the threaded hole is arranged in the through hole.
5. The winding device for producing the BOPP film as claimed in claim 1, wherein a distance sensor is arranged right below the winding roller and connected with a control cabinet.
6. The winding device for producing the BOPP film as claimed in claim 1, wherein the elastic member is a spring sheet or a spring ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911280088.6A CN110950142B (en) | 2019-12-13 | 2019-12-13 | Coiling mechanism is used in production of BOPP membrane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911280088.6A CN110950142B (en) | 2019-12-13 | 2019-12-13 | Coiling mechanism is used in production of BOPP membrane |
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| CN110950142A CN110950142A (en) | 2020-04-03 |
| CN110950142B true CN110950142B (en) | 2021-12-14 |
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| CN110950142A (en) | 2020-04-03 |
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